I would recommend either fescue, or rygrass, as these are more urine tolerant. For the most part, a little dog urine won't hurt the lawn, but excessive use of the same spot will definitely have an affect. There is a possibility that it could be a fungal infection, but it may not. This article will explain how to test that: https://www.gardeningknowhow.com/lawn-care/lgen/dog-urine-grass.htm